Based on legal precedence. Yamataya v. Fisher, 189 U.S. 86, 100–01 (1903); summary..
Aliens physically present in the United States, regardless of their legal status, are recognized as persons guaranteed due process of law by the Fifth and Fourteenth Amendments.
Additionally, foreign nationals living among us are "persons" within the meaning of the Constitution, and are protected by those rights that the Constitution does not expressly reserve to citizens. The Dictator is deporting persons that were deprived of their Right to Due Process.